morrison



T. MORRISON.

Chronometer Escapement. No. 28,719. Patented June 12, 1860.

UNITED STATES PATENT ()FFICE.

THOS. MORRISON, OF KINGSTON, NEW YORK, ASSIGNOR TO 0. B. SAFFORD, O1 SAME PLACE.

GI-IRONOMETER-ESCAPEMENT.

Specification of Letters Patent No. 28,719, dated June 12, 1860.

To all whom it may concern:

Be it known that I, THOMAS MORRISON, of Kingston, in the county of Ulster and State of New York, have invented a new and Improved Ghronometer-Escapement which may be Attached to the Train of any Watch or other Timepiece; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of. the same, reference being had to the accompanying drawings, and the letters of reference marked thereon, making a part of this specification, in which- The depting bar A, Figure 1, has a small semi-circular arm B, in the end of which a pin C, is inserted. It has also attached to the side from which the arm extends a feather or hair spring D, extending a short distance beyond the end of the bar.

The friction roller E, Fig. 2, attached to the staff of the balance wheel, has two notches F and G and a small pin inserted in it at H.

The adjustment of the parts is shown in Fig. 8.

I is the escape wheel, E, is the friction roller, A is the depting bar which is attached to a small staff J upon which it plays with an oscillating motion. Like other depting bars it has a small pin K inserted in it.

Impulse having been given the balance wheel, the pin H, Fig. 3, inserted in the friction roller E, presses against the feather spring D, and the pin G in the arm of the depting bar is carried to F, the angle of the larger notch in the friction roller, and the pin K, in the other end of the bar is moved from before the tooth of the escape wheel, while another tooth of the escape wheel passes into the notch G, Fig. 2, of the friction roller, and in escaping gives a new impulse to the balance wheel. The pin C, Fig, 3, is then carried up the inclined plane from F to L, and the pin K, is thrown before another tooth of the escape wheel bringing the escapement to its first position. By this combination I obtain a less set than in other escapements being only the distance from the pin H, to the feather spring D, as shown in Fig. 3, and in the attachment of my chronometer escapement to the train of a left hand movement of a watch or other time-piece (as shown in the annexed drawings) I also by the action of the tooth of the escape wheel in the notch G, give an additional impulse to the balance wheel, thus rendering it almost impossible by sudden jars or otherwise to stop the motion of the watch or time piece, but in its application to the right hand movement from the difference in position of the friction roller E, the notch G, is unnecessary.

What I claim as my invention and desire to secure by Letters Patent is The arm B, Fig. l, of the deptingbar, the form and peculiar position of the feather spring D, acting in combination with and attached to the depting bar A, as a lever, the pin C, in the arm of the depting bar, the two notches F and G, in the friction roller, Fig. 2, attached to the balance wheel and the combination of the parts as shown in Fig. 3, substantially as set forth and described.

THOMAS MORRISON.

\Vitnesses RUB. IV. TAPPEN, A. C. PECK. 

